From: Alex Sierra alex.sierra@amd.com
This flag is useful at cpu invalidation page table decision. Between select queue eviction or page fault.
Signed-off-by: Alex Sierra alex.sierra@amd.com Signed-off-by: Felix Kuehling Felix.Kuehling@amd.com --- drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 4 +++ drivers/gpu/drm/amd/amdkfd/kfd_process.c | 36 ++++++++++++++++++++++++ 2 files changed, 40 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h index 7d70af26b5c7..d66430740e52 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h +++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h @@ -824,6 +824,8 @@ struct kfd_process { /* shared virtual memory registered by this process */ struct svm_range_list svms; bool svm_disabled; + + bool xnack_enabled; };
#define KFD_PROCESS_TABLE_SIZE 5 /* bits: 32 entries */ @@ -877,6 +879,8 @@ struct kfd_process_device *kfd_get_process_device_data(struct kfd_dev *dev, struct kfd_process_device *kfd_create_process_device_data(struct kfd_dev *dev, struct kfd_process *p);
+bool kfd_process_xnack_supported(struct kfd_process *p); + int kfd_reserved_mem_mmap(struct kfd_dev *dev, struct kfd_process *process, struct vm_area_struct *vma);
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_process.c b/drivers/gpu/drm/amd/amdkfd/kfd_process.c index 321895d7555a..c8479f6bd68c 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_process.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_process.c @@ -1193,6 +1193,39 @@ void kfd_process_set_trap_handler(struct qcm_process_device *qpd, } }
+bool kfd_process_xnack_supported(struct kfd_process *p) +{ + int i; + + /* On most GFXv9 GPUs, the retry mode in the SQ must match the + * boot time retry setting. Mixing processes with different + * XNACK/retry settings can hang the GPU. + * + * Different GPUs can have different noretry settings depending + * on HW bugs or limitations. We need to find at least one + * XNACK mode for this process that's compatible with all GPUs. + * Fortunately GPUs with retry enabled (noretry=0) can run code + * built for XNACK-off. On GFXv9 it may perform slower. + * + * Therefore applications built for XNACK-off can always be + * supported and will be our fallback if any GPU does not + * support retry. + */ + for (i = 0; i < p->n_pdds; i++) { + struct kfd_dev *dev = p->pdds[i]->dev; + + /* Only consider GFXv9 and higher GPUs. Older GPUs don't + * support the SVM APIs and don't need to be considered + * for the XNACK mode selection. + */ + if (dev->device_info->asic_family >= CHIP_VEGA10 && + dev->noretry) + return false; + } + + return true; +} + /* * On return the kfd_process is fully operational and will be freed when the * mm is released @@ -1232,6 +1265,9 @@ static struct kfd_process *create_process(const struct task_struct *thread) if (err != 0) goto err_init_apertures;
+ /* Check XNACK support after PDDs are created in kfd_init_apertures */ + process->xnack_enabled = kfd_process_xnack_supported(process); + err = svm_range_list_init(process); if (err) goto err_init_svm_range_list;